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-;;; stack-filter.el --- filters for stack-mode -*- lexical-binding: t; -*-
-
-;; Copyright (C) 2014 Sean Allred
-
-;; Author: Sean Allred <code@seanallred.com>
-;; Keywords: help, hypermedia, mail, news, tools
-
-;; This program is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; This program is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;;
-
-;;; Code:
-
-
-;;; Dependencies
-
-(require 'stack-core)
-
-
-;;; Customizations
-
-(defconst stack-filter-cache-file
- "filters.el")
-
-(defvar stack-filter
- 'default
- "The current filter.
-To customize the filter for the next call
-to `stack-core-make-request', let-bind this variable to the
-output of a call to `stack-core-compile-filter'. Be careful! If
-you're going to be using this new filter a lot, create a variable
-for it. Creation requests count against
-`stack-core-remaining-api-requests'!")
-
-
-;;; Compilation
-
-;;; TODO allow BASE to be a precompiled filter name
-(defun stack-filter-compile (&optional include exclude base)
- "Compile INCLUDE and EXCLUDE into a filter derived from BASE.
-
-INCLUDE and EXCLUDE must both be lists; BASE should be a symbol
-or string."
- (let ((keyword-arguments
- `((include . ,(if include (mapconcat
- #'stack-core-thing-as-string
- include ";")))
- (exclude . ,(if exclude (mapconcat
- #'stack-core-thing-as-string
- exclude ";")))
- (base . ,(if base base)))))
- (let ((response (stack-core-make-request
- "filter/create"
- keyword-arguments)))
- (url-hexify-string
- (cdr (assoc 'filter
- (elt response 0)))))))
-
-
-;;; Storage and Retrieval
-
-(defun stack-filter-get (filter)
- "Retrieve named FILTER from `stack-filter-cache-file'."
- (cdr (assoc filter (stack-cache-get stack-filter-cache-file))))
-
-(defun stack-filter-store (name &optional filter)
- "Store NAME as FILTER in `stack-filter-cache-file'.
-
-NAME should be a symbol and FILTER is a string as compiled by
-`stack-filter-compile'.
-
-If NAME is a cons cell, (car NAME) is taken to be the actual NAME
-and (cdr NAME) is taken to be the actual FILTER. In this case,
-the second argument is simply ignored."
- (let ((name (if (consp name) (car name) name))
- (filter (if (consp name) (cdr name) filter)))
- (unless (symbolp name)
- (error "Name must be a symbol: %S" name))
- (let* ((dict (stack-cache-get stack-filter-cache-file))
- (entry (assoc name dict)))
- (if entry (setcdr entry filter)
- (setq dict (cons (cons name filter) dict)))
-
- (stack-cache-set stack-filter-cache-file dict))))
-
-(defun stack-filter-store-all (name-filter-alist)
- (mapc #'stack-filter-store name-filter-alist))
-
-(provide 'stack-filter)
-;;; stack-filter.el ends here